Sparker.



PATENTED MAR. 8, 1904 F. DIGKINSON.

SPARKER. APPLICATION FILED JUNI; 15. 190s.

N0 MODEL.

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STATES Patented March s, 1904.

linrnivr @einenl FRANK DCKINSQN, OF SPRINGPORT, MICHIGAN.

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SPECIFICAT-ON forming part of- Letters Patent No. 754,28dated March *8, 1904.

Appucannhed June 15, 1903.

To @ZZ whom t may concern:

Be it known that 1, FRANK DIoKINsoN,a citi- Zen of the United States, residing at Spring' port, in the county of Jackson and State of itiichigan, have invented new anduseful Improvenients in Sparkers, of which 'the following is a specification.

This invention relates particularly to sparkers Y,for ignitmg gas-enfrines, and has' for its object to provide an improved construction whereby the. time of sparking may be' variedand this while the engine 1s m motion.

12, and 1 indicates the base-plate having a reduced portion 1a titted 1n and through'an open` ing in the top o1 the valve-casing, to vwhich the plate is secured by screws 1. The rock-shaft 3, which carriesthe movable electrode 7, extends through this plate and finds its-bearings therein and in a bracket 2,projecting from the upper side or the plate. rEhe stationary electrodc is indicated at 8, having a stem 8a extending through and insulated from the plate.

Lcoseiy mounted upon the shaft'is a yokehammer 4, the arms of which have eyes through which the shaft 3 extends. Between the arms of the lover the anvil 5 is sleeved upon the shaft and is made tast theretoby a set-screw, (indicated at 5".) The anvil has a projection or head 5", which 'is adapted to be struck by the engaging hammer 4, as more fully hereinafter described. it 6 is indicated a spring coiled around the shaft and having its ends attached, respectively., to the anvil 5 and one arm of the lever 4. The spring acts to make the hammer hit the anvil and also by its upward or outward pressure against the anvil, which is fast Fig. 2 is a serial ro. 161,535. un man.)

to the shaft, tomaintain a gas-.tight joint between the shaft and the plate 1.

The push-rod for operating the sparkerl is indicated at 14, and it may receive its motion to snap back over the'endof the hammer on the back motion. The free end of the push-- rod 14 is'oarried ina guide-bearing 19, projecting from a timing-slide 11. This slide is movable sidewise with respect to the line of the push-rod and has a guide-rib. 11?, which works in a groove in the ledge of the plate 1',

where it is,A retained by a screw 11b, which extends through a slot in the slide. The end of the slide is offset around the corner of the plate, as at 11, to give a, bearing for the adjusting set-screw 10,A the foot of which is tapped into the edge of theplate 1. By adj usting the screw the slide is moved back and fortl1,thereby changing the lap of the engaging hammer 4 with respect -to the catch 17, and consequently the time of the Arelease of the rock-shaft and sparking` points.

In operationthe thrust of the push-rod causes the catch v17 to engage the end -of the hammer .4 and turns the same and with it the shaft 3 through the spring and anvil 5 until the electrode 7 cornes in contact with the electrode 8. Further. movement ofthe push-rod' and-.hammer is absorbed vby the spring 6,and the hammer leaves the anvil-head 5". When the point of release is reached, the hammer 4 iiies back and hits the head 5b, throwing the anvil back and with it the rock-shaft. This gives a very quick separation of the electrodes and a bright fat spark, because the hammer 4 hits the anvil 5 while in motion. On the back stroke of the push-rod the catch 17 snaps over the beveled end of the hammer 4 and resumes its position for the next stroke. As

above indicated, the time of firing may be varied by shifting the slide 11 to lchange the lapand timeof release of the catch and the hammer, and this can be done while the engine is in motion.

1t is to be understood that the scope of the 5 invention is not limited further than is indicated in the accompanying claim.

What I claim as new, and desire to secure by Letters Pat-ent, is-

In e sparking mechanism, the combination I 0 with a plate carrying the electrodes, of a pushrod actuating the movable electrode, and :in

tQthis specification in the presence of two suh- Scribingg; witnesses.

FRANK DICKINSON. Wi tn esses:

ANDY M. JOHNSON, Ross W. BURGESS. 

